| 摘要 |
<p>In order to set up a videophone communication from a calling videophone terminal to a called videophone terminal filtered by a telephone set, once a telephone communication has been set up between the terminals, over a CCBNT channel, a service message included in a message for freeing the CCBNT line is sent from the called terminal. This message contains a secret (unfiltered) direct call number for the called videophone. A connection over two type B channels is set up again directly, from the calling terminal, using the secret unfiltered call number. <IMAGE></p> |
